Worm-thread-polishing machine



Feb. 28, 1928. 1,660,811.

. J. L. PERKINS I v WORM THREAD POLISHING MACHINE Filed March 31, 1927 FlE'Llf E /3 u.u u u 1 u..u

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' BY JJ M,

. ATTORNEY.

forth.

Patented Feb. 28, 1928;.

UNITED 's r'rs JULIAN L. PERKINS, OF WEST SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO PER- KIN S MACHINE AND GEAR COMPANY. OF SPRINGFIELD, MASSACHUSETTS, A COR- PORATION OF MASSACHUSETTS.

WORM-THREAD-POLISHING MAC.v

Application filed March 31, 1927. Serial No. 179,954.

My invention relates to improvements in machines for polishing the threads of worms, and consists essentially of a hollow, rotary head open at one end. and provided inside with a.liner having interior, circular teeth which are shaped to fit the. worm threads to be polished, said teeth being with out any lead, and a Work-holding spindle arranged to rotate and for endwise movement in an adjustable and rocking or swinging bearing, and means to apply pressure to the spindle-carrying parts and thereby force the worm attached to said spindle into close contact with said liner, it being understood that said spindle is adapted to be moved to position said worm inside of the liner, together with such other parts and members as may be necessary or desirable in order to render the machine complete and serviceable in every respect, all as hereinafter set The primary obj ect of my invention is to produce a comparatively simple and inexpensive, yet highly efiicient, machine for polishing the threads of worms of different sizes, leads, and hands. By the latter term I tation imparted to the work while in com;

is meant the directions of threads on worms, the direction of the threads on right-hand worms being to the right, and the direction of the threads on theleft-hand worms being to the left. g

A further object is to provide, in a machine ofthis character, convenient means or mechanisms respectively for rotating the work by hand, while said-work is in contact with the polishin element, and thus made for varying at wi 1 both the amount of rotact with the polishing element, and the depolis gree of pressure between said work and said element, whereby it is possible to polish the work to the best advantage and obtain the desired results. I I

Other objects and advantages will appear in the course of the following description.

I attain'the objects and secure the advantages of my invention by the means .illustrated in the accompanying drawings, in Which-f I Figure 1 is a top kin of a worm-thread ing machine w ich embodies a practical form of my invention; Fig. 2, a righthand end elevation of said machine, the outer terminal of the work spindle being broken off, and a portion of the supporting bed broken out, and, Fig. 3, a central 1ongitudinal, vertical section through said machine, taken on lines 3-3, looking in the direction of the associated arrow, in Fig. 1.

Similar reference characters designate similar parts throu hout the several views.

.In Figs. 2'an 3 is represented at l a bed, and at 2 a floor line. The bed 1 is supported by any suitable means from the floor, and in each of the two views, wherein said bed and the floor line 2 appear, allowance is not made for the full distance which actually should exist between the two.

Mounted on the bed 1 is a frames. The Y frame 4 has at one end a raised part 5 from which rise two bearings 6. The axes of the bearings 6 arch the longitudinal, vertical, central plane of the: frame, and of the machine as a whole. In the top of frame 4, a short distance from the end which is opposite to that where the raised part 5 is located,-

is an inverted T-slot 7 thatextends transversely across said top and opens throughv opposite edges or sides thereof.

The bearings 6 .are bushed, and journaled in said bearings is a shaft 8 on which are mounted between said bearings pulle s 9 and 10. The pulley 9 is loosely mounte on the The shaft 8 extends beyond the inner bear ing 6, and mounted on this protruding terminal of said shaft is a hub 13 of a hollow head 14. The head 14 is closed at the outer end andopen at the inner end, and the hub 13 is in the center of the closed end. The hub 13 is secured to the shaft'8 by any suitable means, as by a key 15 and two screws 16. Secured inside of the c lindrical wall of the head 14 is an annular 'ner 17 havin on the inside thereof a luralit of integra, circular'or annular-tact 18. 0, spaces tween the teeth '18 and said teeth in cross bea section, in shape and size, approximate the shape and size of the threads and the spaces therebetween of the worm which this liner, is adapted to act on. The teeth .18 have no lead, however, the liner 17 including the teeth 18 thereof is usually-made of leather. The serrated portion of the liner 17 is coated with emery powder or aste, or other abrasive or olishing mater al, before the work is broug t into contact therewith, to facilitate ,the polishing operation.

Mounted on the top of the frame 4and extending partly over the T-slot 7 in said top is a plate 19 from which rise a air of lugs 20. This plate forms part 0 a carrier. The lugs 20 are adjacent to the rear and outer edges of.the plate 19, and said lugs having journaled therein a short rock shaft 21, which shaft is or may be parallel with the longitudinal vertical plane of the machine. The plate 19 has therein a slot 22'.

which is located over the T-slot 7, by means of .a bolt 23, and is or may be positioned at right-angles to said T-slot. The bolt 23 has at the lower end a square head 24 that is received in the wider portion of the T-slot 7, and adapted to slide therein, as the shank of said bolt is adapted to slide in the narrower portion of said T-slot. The bolt 23 extends above the level of the plate 19, and aunt 25 is threaded onto this upper part of said bolt.

Upon loosening the nut 25, the plate 19 can be moved either to the right or to the left within the limitsfixed by the slot 22, can be moved forwardl and rearwardly, the bolt 23 then sliding 1n the T-slot 7, and can be adjusted on said bolt as an axis. ,After the plate 19 has been moved and adjusted to whatever. extent may be needed, the nut 25 is retightened. The adjustment thus afforded-enables the work to be set at such an angle to the axis of the liner 17' as is requiredby the lead anfgle, and hand of the work, that is to say, 0 the worm to be pol-.

ished, as will subsequently more clearly apear.

Mounted on the shaft .21' and extending forwardly therefrom over the top of the plate 19 is an arm 26, from which arm rises 11 bushed bearingl27. The arm'26 is also a part of the aforesaid carrier. The axis of the bearing 27 is arallel with the'axis of the shaft 21; The caring .27 is provided for a work-holding spindle 28. The spindle 28 of said cord being attached at 33 to the for-u Y ward end of said arm, and the lower end'o'f said'cord being attached at 34 to said treadle forward of the pivot 30. The cord 32, passes through vertical openings 40 and 41 made in the top of the frame 4 and in the bed 1, re-

for the hollow, split terminal of the spindle i 28. The passage in the spindle 28, except at the inner terminal," is. tapered, as also is the main-body portion of the expander 36,

while the inner-terminal portion of said expander is externally screw-threaded,fas rep resented at 37 to engage the screw-threads in said inner-end portion of said passage. The expander 36 is of suflicient length to project from the spindle 28, even when tightened therein, and this protruding part is cylindrical, and provided with a pin 38 which forms a handle to facilitate manipulation of said ex ander.

he spindle- 28 end with a hand crank 39.

In practice, aworm, as 42, the threads of which correspond in size and shape with the is provided at the outer I liner teeth 18, is slipped onto the split ter-' minal of the spindle 28, while the expander- 26 is loose in said spindle, and then said" expander is rotated to screw the same tightly into the passage in said spindle.- This movement on the part of the expander 36 thrusts the split sections or portions of the spindle outwardly and causes themtightly to engage the sides of the bore in the work 42 and thus secure by friction said worm to said spindle. worm 42 is secured to the spindle 28, the

nut 25 is loosened and the carrier plate 19 is adjusted-to whatever extent, may be needed to cause said worm to be presentedto or enga with the liner 17 at the proper angle an hand, and in the otherwise required Either before or after the position to enable the worm to be located on the bottom of said liner. The spindle 28 at this time is disposedoutwardly and clear of the head 14. If the carrier plate 19 has not already been adjusted for the type of the shaft 8. ,.-,;With the worm 40 in the position illustrated in Fig. 3,.the same is rotated by hand through the medium of the crank 39 and the spindle 28, and said worm is pressed down into close contact with the liner 17 by means of the pedal 29 acting throu h the cord 32, the arm 25 with itS bea ri and to be polished, saidplate is next adjusted to whatever and in whatever directhe spindle 28, such pressure being varied to whatever extent may be necessary by varying the pressure of the foot on the treadle 28.

At the end of the polishing operation, the foot is taken from the treadle 28, the arm 26 is lifted far enough to enable the worm threads to clear the liner teeth 18, the spindle 28 is drawn outwardly to. remove the worm from the head 14, and said arm is permitted to swing down onto the plate 19 or the top ofthe frame 4; Finally the expander 36 loosened in the spindle 28 to the extent necessary to release the worm 4:0, and said worm is withdrawn from said spindle. "The operations just described are performed each time a worm is polished, except that the carrier is adjusted only when the character of the worm calls for such adjustment.

More or less change may be made in the shape, size, construction, and arrangement of some or all of the parts of this machine,

without departing from the spirit of my invention or exceeding the scope of whatis claimed.

What I claim as my invention,-and desire to secure by Letter-s Patent, is-

'1. In a machine, of the class described, a rotary liner, a spindle provided at one terminal with work-holding means, and at the other terminal with means to operate said spindle by hand, and means to support said spindle and enable the same to be moved longitudinally to carry said work-holding means into and out of operative relation with said-liner, and to be rotated.

2. In a machine,,of the class described, a rotary liner, a spindle provided at one terminal with work-holding means, and at the other terminal with means to operate said spindle by hand, means to support said spindle and enable the same to be moved longitudinally to carry said work-holding means into and out of operative relation with said liner, and to be rotated, and foot-operated means to apply pressure laterally to said spindle and the work carried thereby while in contact with said liner.

3. In a machine, of the class described, arotary liner, a spindle provided at one terminal with work-holding means, and at the other terminal with means to operate said spindle by hand, means to support said spindle and enable the same to be moved longitudinally to carry said work-holding means into and out of operative relation with said liner, and to be rotated, and means to adjust said spindle'at an angle to the axis of said liner.

4.. In a machine, of the class described, a rotary liner, :1 spindle provided at oneterminal with work-holding means, and at the other terminalwith means to operate said spindle by hand, means to support said spindle and enable the same to be moved longitu dinally to carry said work-holding means into and out of operative relation w1tl1 said liner, and to be rotated, means to adjust said spindle at an angle to the axis of said liner, and foot-operated means to apply pressure laterally to said spindle and the work held thereby while in contact with said liner.

5. In a machine, of the class described, a rotary liner having an interior annular toot-h with its sides throughout in parallel planes, and being without a lead, and adapted to intel-engage worm threads, and a work-holding spindle mounted for longitudinal and rotary movement, whereby said spindle is enabled to cooperate with said liner.

6. The combination, in a machine of the class described, with a hollow rotary head provided on the inside with an interiorly serrated liner,iof a bearing, a spindle journaled in said bearing and adapted to be moved lengthwise therein, means to secure a longitudinally therein, means to secure a worm to said spindle at one terminal in position to enable the same to be acted on by said liner, when said. spindle is moved to bring said worm into contact with said liner, and means at the other terminal of said spindle to operate it by hand.

8. The combination, in a machine of the class described, with a hollow rotary head providedon the inside with a liner having interior serrations, of a carrier plate, an arm pivotally connected with said plate, and provided witha' bearing, a shaft journaled in said bearing and adapted to be moved lengthwise therein, means to secure a worm to said spindle at one terminal in position to enable the same to be acted on by said liner, when said spindle is moved to bring said worm into contact with said liner, and means at the other terminal of said spindle to operate it' by hand.

9. The combination, in a machine of the class described, with a hollow rotary head provided on the inside with a liner having interior serrations, of a carrier plate, an arm pivotally connected with said plate, and provided with a bearing, a spindle journaled in said bearing and movable longitudinally therein, means to secure a worm to said spindle at one terminal in position to enable the same to be acted on-by saidliner, when said spindle is moved to bring said worm into contact with said liner, means at the otherterminal of said spindle to operate the same by hand, a foot treadle, an'd aconnec- 'tion between said arm and said treadle.

10. The combination, in a' machine of the class described, with a frame provided with bearings, a shaft journaled in said bearings, ahollow head secured to said shaft, and provided on the inside with a liner having interior teeth, of a carrier plate on said frame and provided with a bearing, releasable means to secure said plate,to.said frame, and

permit said plate to he'adjuste'd longitudinally and transversely" and on said means as an axis, a spindle journaledinsaid bearing and capable of being rotated and moved longitudinally therein by hand, and means to secure a worm to one terminal of said spindle, whereby the latter can be moved longitudinally in said bearing to carry said worm into contact with said liner, and rotated in com tact therewith, and removed front such contact.

JULIAN L. PERKINS 

